Just Got GA Belt and Need Help!

Wow this place is still the same! Good to know! i.e. I havent been here in a bit!
Ok I got my new belt in from Gunners Alley. I got the 1.5" cordura with nickel hardware. Before I was wearing a R'Tree and York dress belt. Yeah! Well If I had to choose which one I like better Id say the R&K! How is this possible? Ive come to the conculsion that its the holster Im using. It worked fine with a thin little dress belt but its very very uncomfortable with the GA belt. The holster I have is the cheap Don Hume H715 for my P99 compact. I wear IWB 95% of the time. I wear jeans,shorts, and t-shirts untucked most of the time. Am I correct is it time to get a better holster and if so what. Do I need as low of a IWB as I can get? Anyone help would be great before I go on the long holster journey. Im tempted to go back to the dress belts.